Elon Musk, CEO and CTO of SpaceX, introduces the Dragon V2 spaceship at the company's headquarters in Hawthorne, Calif., in May 2014. Musk predicted during an interview at the Code Conference in Southern California on June 1 that people would be on Mars in 2025. Jae C. Hong/AP hide caption

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Jae C. Hong/AP

A handout picture made available by SpaceX shows a Falcon 9 rocket landing upright at Cape Canaveral Air Force Station in Florida. SpaceX successfully returned a rocket to Earth following Monday's satellite launch after two earlier attempts failed. SpaceX/EPA/Landov hide caption

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The SpaceX Falcon 9 rocket and Dragon spacecraft break apart shortly after liftoff from the Cape Canaveral Air Force Station in Cape Canaveral, Fla., on June 28. SpaceX CEO Elon Musk said Monday the failure of a steel strut likely caused the rocket to explode. John Raoux/AP hide caption

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John Raoux/AP

On Friday, a Russian Soyuz rocket will send an unmanned cargo ship with more than 3 tons of food, water and fuel for astronauts aboard the International Space Station. Russian Federal Space Agency hide caption

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Russian Federal Space Agency

Russian Rocket Poised For Crucial Supply Run To Space Station

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